2026 ICD-10-CM Diagnosis Code L02.639Carbuncle of unspecified foot

ICD-10-CM Codes›L00–L99›L00-L08›L02

ICD-10-CM L02.639
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

L02.639 is a billable ICD-10-CM diagnosis code for carbuncle of unspecified foot. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 602 through 603. Coders also document this condition as carbuncle of foot. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Skin and subcutaneous tissue infections.

Code Identity

ICD-10-CM Code
L02.639
Billable Status
Yes — Valid for Submission
Code Describes
Carbuncle of unspecified foot
Short Description
Carbuncle of unspecified foot
Same as the full description in the CMS dataset.
Parent Code
L02.63
Carbuncle of foot

Code Classification

ChapterL00–L99Diseases of the skin and subcutaneous tissue
SectionL00-L08Infections of the skin and subcutaneous tissue
CategoryL02Cutaneous abscess, furuncle and carbuncle
This CodeL02.639Carbuncle of unspecified foot

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Carbuncle of foot
  • Carbuncle of heel
  • Carbuncle of toe

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR SKN001
Skin and subcutaneous tissue infections
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Skin Infections

Your skin is your body's largest organ. It has many different functions, including covering and protecting your body. It helps keep germs out. But sometimes the germs can cause a skin infection. It often happens when the germs enter your body through a break, cut, or wound on your skin.

The full article covers:

  • What are skin infections?
  • What causes skin infections?
  • Who is more likely to get a skin infection?
  • What are the symptoms of skin infections?
  • How are skin infections diagnosed?
  • How are skin infections treated?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert L02.639 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
680.7 Carbuncle of foot
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About L02.639Overview

Is L02.639 (Carbuncle of foot) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report carbuncle of unspecified foot on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does L02.639 group to?

When carbuncle of unspecified foot is the principal diagnosis on an inpatient stay, it groups to MS-DRG 602, 603, with relative weights from 0.8709 to 1.4213 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of L02.639?

Under the General Equivalence Mappings, carbuncle of unspecified foot converts to ICD-9-CM 680.7 (carbuncle of foot). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.